24 PHYSICAL GEOGRAPHY. 



MOUNTAIN EXPLORATIONS. 



During the second year, the Moosilauke winter exploration was carried 

 out by J. H. Huntington and Amos F. Clough. This is sketched, as fully 

 as needed for our purposes, in the chapter upon the history of explora- 

 tions among the White Mountains. 



Possibly there may be space, in the chapters upon scenery, to quote 

 from Mr. Vose's report upon an ascent of Mt. Carrigain, made during 

 this year. 



MEASURING SECTIONS. 



In a letter directed to Rev. Dr. Asa D. Smith, President of the New 

 Hampshire College of Agriculture and the Mechanic Arts, and printed in 

 his report for 1869, I set forth my views as to the best method of exhib- 

 iting the specimens of rocks collected during our explorations. It was sug- 

 gested that these should be collected along lines about fifteen or twenty 

 miles apart, running east and west, and parallel to one another, amounting 

 to fourteen in number in all. These lines were called lines of section, 

 because it was proposed to show, in connection with the specimens, a 

 geological profile and section. This method of studying the geological 

 structure of the state readily commends itself to every mind. 



We crossed the state eight times during this season in endeavoring to 

 measure these sections. The lines of section thus measured are, 



I. From Lawrence, Mass., along the south border of the state, to Con- 

 necticut river. 



II. From Seabrook to Chesterfield. 



III. From Portsmouth to Walpole. 



IV. From Great Falls to Charlestown. 



V. From Milton to Cornish. 



VI. From Effingham to Hanover. 



VII. From Errol to Stratford. 



VIII. From Atkinson and Gilmanton Academy grant to Stewartstown. 

 The last two were traversed by Mr. Huntington on foot, as they lie 



chiefly in the unbroken forest. Two sets of specimens have been col- 

 lected along these routes. 



